linux-kernel - Re: perf usage of arch/arm64/include/asm/cputype.h

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Message-ID: <20250618130254.GD794930@e132581.arm.com>
Date: Wed, 18 Jun 2025 14:02:54 +0100
From: Leo Yan <leo.yan@....com>
To: Yicong Yang <yangyicong@...wei.com>
Cc: Mark Rutland <mark.rutland@....com>, yangyicong@...ilicon.com,
	Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>,
	James Clark <james.clark@...aro.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	Ali Saidi <alisaidi@...zon.com>, Leo Yan <leo.yan@...aro.org>,
	Will Deacon <will@...nel.org>, James Morse <james.morse@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	yangjinqian <yangjinqian1@...wei.com>,
	Douglas Anderson <dianders@...omium.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Ian Rogers <irogers@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Kan Liang <kan.liang@...ux.intel.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: perf usage of arch/arm64/include/asm/cputype.h

On Wed, Jun 18, 2025 at 07:51:03PM +0800, Yicong Yang wrote:

[...]

> >> Directly including the kernel header introduces the very fragility that
> >> having a copy was intended to avoid. NAK to that.
> > 
> > My suggestion is not to include the kernel header, nor to modify the
> > copy header. :)
> > 
> > Instead, I suggested creating a new header within the perf tool (under
> > perf's arm64 folder) and then include the copy header in tools:
> > 
> >   tools/arch/arm64/include/asm/cputype.h
> > 
> 
> sorry for the misunderstood.:(
> in this way we still have the divergency in the long term and as a workaround
> this works same if we partly update the tools/arch/arm64/include/asm/cputype.h
> with only necessary MIDR updates and keep is_midr_in_range_list() unchanged.

Yes. So Mark's suggestion is reasonable that we can do refactoring first
to avoid syncing header.

[...]

> > @Yicong, could you confirm if you proceed to refactor the MIDR? thanks!
> 
> please feel free to take this over.

Thanks a lot for confirmation!  And thanks for working on the reported
issue.

> > Just note, I searched tools folder and found kselftest also uses the
> > cputype.h header. The refactoring should not break the files below.
> > 
> 
> they shouldn't affected. I did a kselftest build test with my latest patch
> and they were not affected.

I expect tools/arch/arm64/include/asm/cputype.h will be removed, and
a generated header (something like sys-midr.h) for MIDR refactoring.
If this is true, then we need to take care kselftest.

Thanks,
Leo